Loading maps causes heavy texture bugs

Hey,
so when im loading e.g. the boss house for franklin, or others like this, my textures gets muddy and bugging till its... invisible. i dont know really why, i hope that the redux mod have nothing to do with it.
installed mods: redux mod an a large car replace mod.
my hardware, if it helps:
2x GTX 970
i7 5820K
16 GB RAM
GTA is installed on a SSD

I run approx 50 scripts in the scripts folder
Some of them are heavy on the game probably
I can run Spa Francorchamps with that, but not Ambush, Nordschleife, Laguna Seca and Lakeview alongside then
In which case I lose LOD0 when the game starts
So, instant memory issues